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Deprecate inclusion of <sys/sysmacros.h> by <sys/types.h>
The macros defined by <sys/sysmacros.h> are not part of POSIX nor XSI, and their names frequently collide with user code; see for instance glibc bug 19239 and Red Hat bug 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the problem. * NEWS: Inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. * misc/sys/sysmacros.h: If __SYSMACROS_DEPRECATED_INCLUSION is defined, define major, minor, and makedev to issue deprecation warnings on use. If __SYSMACROS_DEPRECATED_INCLUSION is *not* defined, suppress previously-activated deprecation warnings for these macros and prevent subsequent inclusions of this header from having any effect. * posix/sys/types.h: Define __SYSMACROS_DEPRECATED_INCLUSION before including <sys/sysmacros.h>, and undefine it again afterward.
This commit is contained in:
Zack Weinberg
parent
63eb8df85a
commit
dbab6577c6
12
ChangeLog
12
ChangeLog
@ -1,3 +1,15 @@
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2016-08-03 Zack Weinberg <zackw@panix.com>
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[BZ #19239]
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* NEWS: Inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated.
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* misc/sys/sysmacros.h: If __SYSMACROS_DEPRECATED_INCLUSION is defined,
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define major, minor, and makedev to issue deprecation warnings on use.
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If __SYSMACROS_DEPRECATED_INCLUSION is *not* defined, suppress
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previously-activated deprecation warnings for these macros and prevent
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subsequent inclusions of this header from having any effect.
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* posix/sys/types.h: Define __SYSMACROS_DEPRECATED_INCLUSION before
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including <sys/sysmacros.h>, and undefine it again afterward.
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2016-08-03 Zack Weinberg <zackw@panix.com>
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* sysdeps/generic/sys/sysmacros.h: Delete file.
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10
NEWS
10
NEWS
@ -17,6 +17,16 @@ Version 2.25
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from that TS. Note that most features from that TS are not supported by
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the GNU C Library.
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* The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
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means that in a future release, the macros “major”, “minor”, and “makedev”
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will only be available from <sys/sysmacros.h>.
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These macros are not part of POSIX nor XSI, and their names frequently
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collide with user code; see for instance glibc bug 19239 and Red Hat bug
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130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
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presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
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problem.
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Security related changes:
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[Add security related changes here]
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@ -16,6 +16,23 @@
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _SYS_SYSMACROS_H_OUTER
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#ifndef __SYSMACROS_DEPRECATED_INCLUSION
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# define _SYS_SYSMACROS_H_OUTER 1
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#endif
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/* If <sys/sysmacros.h> is included after <sys/types.h>, these macros
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will already be defined, and we need to redefine them without the
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deprecation warnings. (If they are included in the opposite order,
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the outer #ifndef will suppress this entire file and the macros
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will be usable without warnings.) */
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#undef major
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#undef minor
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#undef makedev
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/* This is the macro that must be defined to satisfy the misuse check
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in bits/sysmacros.h. */
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#ifndef _SYS_SYSMACROS_H
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#define _SYS_SYSMACROS_H 1
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@ -23,32 +40,65 @@
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#include <bits/types.h>
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#include <bits/sysmacros.h>
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/* The extra "\n " moves gcc's [-Wdeprecated-declarations] annotation
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onto the next line. */
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#define __SYSMACROS_DEPRECATION_MSG(symbol) \
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"\n In the GNU C Library, `" #symbol "' is defined by <sys/sysmacros.h>." \
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"\n For historical compatibility, it is currently defined by" \
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"\n <sys/types.h> as well, but we plan to remove this soon." \
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"\n To use `" #symbol "', include <sys/sysmacros.h> directly." \
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"\n If you did not intend to use a system-defined macro `" #symbol "'," \
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"\n you should #undef it after including <sys/types.h>." \
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"\n "
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#define __SYSMACROS_DECL_TEMPL(rtype, name, proto) \
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extern rtype gnu_dev_##name proto __THROW __attribute_const__;
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#define __SYSMACROS_FST_DECL_TEMPL(rtype, name, proto) \
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extern rtype __REDIRECT_NTH (__##name##_from_sys_types, proto, \
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gnu_dev_##name) \
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__attribute_const__ \
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__attribute_deprecated_msg__ (__SYSMACROS_DEPRECATION_MSG (name));
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#define __SYSMACROS_IMPL_TEMPL(rtype, name, proto) \
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__extension__ __extern_inline __attribute_const__ rtype \
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__NTH (gnu_dev_##name proto)
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#define __SYSMACROS_FST_IMPL_TEMPL(rtype, name, proto) \
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__extension__ __extern_inline __attribute_const__ rtype \
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__NTH (__##name##_from_sys_types proto)
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__BEGIN_DECLS
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__SYSMACROS_DECLARE_MAJOR (__SYSMACROS_DECL_TEMPL)
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__SYSMACROS_DECLARE_MINOR (__SYSMACROS_DECL_TEMPL)
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__SYSMACROS_DECLARE_MAKEDEV (__SYSMACROS_DECL_TEMPL)
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__SYSMACROS_DECLARE_MAJOR (__SYSMACROS_FST_DECL_TEMPL)
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__SYSMACROS_DECLARE_MINOR (__SYSMACROS_FST_DECL_TEMPL)
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__SYSMACROS_DECLARE_MAKEDEV (__SYSMACROS_FST_DECL_TEMPL)
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#ifdef __USE_EXTERN_INLINES
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__SYSMACROS_DEFINE_MAJOR (__SYSMACROS_IMPL_TEMPL)
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__SYSMACROS_DEFINE_MINOR (__SYSMACROS_IMPL_TEMPL)
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__SYSMACROS_DEFINE_MAKEDEV (__SYSMACROS_IMPL_TEMPL)
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__SYSMACROS_DEFINE_MAJOR (__SYSMACROS_FST_IMPL_TEMPL)
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__SYSMACROS_DEFINE_MINOR (__SYSMACROS_FST_IMPL_TEMPL)
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__SYSMACROS_DEFINE_MAKEDEV (__SYSMACROS_FST_IMPL_TEMPL)
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#endif
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__END_DECLS
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#endif /* _SYS_SYSMACROS_H */
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#ifndef __SYSMACROS_NEED_IMPLEMENTATION
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# undef __SYSMACROS_DECL_TEMPL
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# undef __SYSMACROS_FST_DECL_TEMPL
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# undef __SYSMACROS_IMPL_TEMPL
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# undef __SYSMACROS_FST_IMPL_TEMPL
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# undef __SYSMACROS_DECLARE_MAJOR
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# undef __SYSMACROS_DECLARE_MINOR
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# undef __SYSMACROS_DECLARE_MAKEDEV
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@ -57,8 +107,14 @@ __END_DECLS
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# undef __SYSMACROS_DEFINE_MAKEDEV
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#endif
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#define major(dev) gnu_dev_major (dev)
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#define minor(dev) gnu_dev_minor (dev)
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#define makedev(maj, min) gnu_dev_makedev (maj, min)
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#ifdef __SYSMACROS_DEPRECATED_INCLUSION
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# define major(dev) __major_from_sys_types (dev)
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# define minor(dev) __minor_from_sys_types (dev)
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# define makedev(maj, min) __makedev_from_sys_types (maj, min)
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#else
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# define major(dev) gnu_dev_major (dev)
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# define minor(dev) gnu_dev_minor (dev)
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# define makedev(maj, min) gnu_dev_makedev (maj, min)
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#endif
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#endif /* sys/sysmacros.h */
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@ -218,8 +218,14 @@ typedef int register_t __attribute__ ((__mode__ (__word__)));
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/* It also defines `fd_set' and the FD_* macros for `select'. */
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# include <sys/select.h>
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/* BSD defines these symbols, so we follow. */
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/* BSD defines `major', `minor', and `makedev' in this header.
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However, these symbols are likely to collide with user code, so we are
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going to stop defining them here in an upcoming release. Code that needs
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these macros should include <sys/sysmacros.h> directly. Code that does
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not need these macros should #undef them after including this header. */
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# define __SYSMACROS_DEPRECATED_INCLUSION
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# include <sys/sysmacros.h>
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# undef __SYSMACROS_DEPRECATED_INCLUSION
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#endif /* Use misc. */
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